Suction motor



- Dec. l13, 1938.

D. KUSKIN sUcTIoN MOTOR Filed Nov. 17, 1934 2 sheets-sheet 1 ATTORN EYS Dec. 13, 193s.

D. KUSKIN suc'xIkoN MOTOR Filed Nov. 17, 1934 2 Sheets-Sheet 2 'a H-IIIII mv m, w

ATTORNEYS Q30 in vertical section, taken reaped Deels, 193s Davia amm, New nek. N. Y., u', l'

' mesnea-Ignmmtgto'lrleohodletacmlam', mn. Y.

application Novanta 11, im, lsei-mis. 153,430

comme.

' uy present invention is concerned with a num pressureoperated motor which may'have a wide. 'u

g and varied range of usefulness but which iinds its preferred embodiment-[in a light dutysucon motor of the type which is suitable for actuang a windshield wiper and which derives its power from the intake manifold of an internal combustion engine or any'other suitable source of suctionvThe present v ment upon the motors disclosed in m'ior Patents A No. 1,912,777 and No. 2,045,861; l

The invention has for its object to provide a light duty motor specially adapted for windl5 shield cleaner use which is eiiicient in"opera` tion and practical in design, and further to provide a motor of the type set forth in the above mentioned prior patents wherein' the resilient bag or diaphragm members are so constructed and mounted as to insure aiongerperiod'ofusev fulness andthereby render the' vmotor more durable and substantial in its construction.

'Ihe invention may be more fully understoodv fromthe following description in connection with theaccomp'anying drawings whereinzl Fig. -1 is a top plan -view of the windshield wiper 'motor embodying the invention, thedust cover thereforebeing shown insection, i ly- Eig. 2 is la view` partly in 'elevatim and partly approximately. onl the 'lineI-IotFigJt 'Q f y Pig.3 is a' fragmentary transverse tail on the'line 3-4 oiFlg. 2, 4is afragmentary'view u to1 m13 and showing one of the working chamber Y walls in aposition intermediate the two extreme positionsillustratedil'iF152,` f j Flg.5 is a sectional detail illustratingl aux-4 iliaryspeed control attachment. I ff 40 ting, motion mechanism.

. mi; armodlncarion inwhlchtne eunli5 tr'o'l elements are maintained against g''butatrightanglestotheplaneofthatview andtakenontheline ll-lloil"lg.8,`and

Flg.11isasectional.viewthroughthemolded V55 rubbercupbeforeitisonthebody.

invention represents an improvey libynnksn'wtneendsofawalkingbeamzmevlng ll'lg.` 6 is a perspective view of the -5 shaftfwhich carrie'spart o( thepower *Y l'iglilisaviewcorrespondinggenel'allyliofla-v (ci. iai-4s) General assembly In illustrating the present invention I have showncnlysomuchof themechanism asisnecessary for an understanding of the improvements hereinclaimedandreferenceishadtotheprior 5 patents, both above identified, for further details ofthebodycastingwithitsportsand passages, the snap valve the cut ofi valve and theparking valve mechanism,

ReierringrsttoFlgalto4ofthedrawings, vthe motor includes abody Il typically of cast metaLthe oppositeA ends of which ail'ord spaced, parallel, open-ended cylinders I I. Between these cylinders the, casting aiiords acentral boss I2 andrisingiromthebossarea pairoiposts I3 vand Il "arranged one behindthe other, and in Ywhich is journalled a. rock shaft IB.- The cylinders I l constitute stationary walls oi collapsibie walled working chambers, the ilexible walls of-.these chambers beingdened by rubber bags R'having .skirt vportionsV I( telescoped over the mout-'haof the cylinders to an extent limited by annular east troughs or stops i1 which encircle 25 the It istobe understood that cyland telesoopedbags are merely illustrativefof one of manyways'in4 which the body and diaphragm members might coact to denne a walled working chamber. The usualports thrmlghfwhichair may be admitted to or vfrom their chambersare Vnotialmown, to prior Patent No. 1.912.717 for one suitable port arrangement. ofbags Rare connected apendant extension!! iixed upon :rock shaft I5. Y Journaled -in bos` I2 directly under rock shaft Il is ay second I3 having a projecting mi uaf adapted-to mount awindshnalal wiper (not ahownl. 4The oscillatory movementofshaftY ISiatraIisJnitted4 to shaft` vthrough theintermediacyof intermesliing eccentric segment-gears Reference be had tomy prior-Patent 2,045,881 fora clear lmderstanding of the manner a snap-valve mechanism S'controlled A by'shaitll places thetwo working chambers al termteiyin n-with the atmosphere f and (througheonduit 6I) with asourceofsub- 50 atmospheric pressure. I have also omitted any showing here 'd the master control valve for cutling the motor out oi' oommimication with suctionline l. althoh thehandle torthiayalve man., u

*ssfmdjn med oneness s and u; Y j

The working chambers As illustrated, the skirt portions I8 of the bags and the central portions I3 of the bags are advantageously of greater thickness than the foldable 'sections I! of the bag which connect them. Means may be provided, if desired, to reinforce the bag centers and to regulate and control the ilexure of the bags. Such means are here illus trated as' inverted, generally cup-shaped, light 1 meter snelle zo, the external' diameter of which is appreciably less than the internal diameter of the cylinders II. The thickened centers I8 of the bags lie against the tops of the inverted cups 20 and areclamped tothese cups by'a pair 15 of teleseeping tmmblee 2| ena z2. The thimbles are provided with outwardly flaring flanges 23. 24

at their mouths. The bag top Il and the center of the cup 2l are provided with registering openings corresponding to the external diameter of.`

2 the upper thimble 2|. As'these thimbies ere forced into telescoping engagement, the flanges 23 and 24 rmly clamp the bagtop I3 to the cup 23. Ihisclamping action insures an airtight connection. By making the bag centers of 25 relatively thick rubber, tight clamping and perfeet sealing may bevaccomplished without split` ting' or unduly gOuging or otherwise injuring the rubber at the clamping region. To the; end. that pressure may be-applied over` a substantial area.

`30 in the center er tne bag, e stia washer member-,z5

'Ihe relatively thin-wall portion I3 of the bag Vispxiedisposedtoilexinaninwardly extending annular bight or fold in all positions of the bag. 45 vPart of this annular fold lies against the skirt of the cup 2l and part of it lies against the inner faceofthecylinderll. Y

Due to the method of molding the bag (which will be more fully hereinafter. explained) the p normal tendency of the bag pbrtion i3 is to assume an inwardly flexed position and to tend to urge the center o f the bag inwardly. The bag is in. fact molded as illustrated in Fig. and afterthe cup 2l has been attached to the center `56 of the bag, the bag center is pushed through the skirt. being'v turned almost inside o ut as indicated in dotted lines.. fl'hus whenfthe skirt is slipped over the cylinder, lthe normal tendency of the bag center is to move downwardly through the 60 skirt, such movement being restrained of course by the attachment of the bag center to the walking beam. This inherent tendency of the bag center to move inwardly is important however in that the annular bight or fold formed in the bag portion I3 always lies between the cylinder and guide cup. 0n the working stroke of the chamber no unnatural or forced ilexure or stretching of the rubber occurs.

As airis' exhausted from the left hand working 10 chamber of Fig. 2, the movable wall of this chamber will start to move inwardly, the thimble 22 and socket 26 coacting to prevent any substantial tilting of the control cup 2l, and the slots 2Gb or other openings in the socket preventing a dashspot effect. As the cup 2l moves'inwardly to approxlmately the intermediate positionv (shown in Fig. 4), it will be seen that part of' the annular bight afforded by the bag portion I9 has in effect been peeled from the outside of the control cup or guide cup and part of the bight. has been 5 drawn (by suction) against the inner` wallgof the cylinder. When the flexible wall, of the chamber has completed its inward stroke, `the parts will be in the position illustrated at'the right hand end of Fig. 2 in which position most 10 of the bight lies against the inner Wall of the cylinder and but a small portion thereof .remains on the guide cup. The existence of sub-atmospherlc pressure within the working chamber prevents the bight from becoming doubly or triply 15 folded and jammed between the outer` Awall of the guide cup and the inner wall of thecylinder, it being borne in mind that that portion of the bight which constitutes the lowest portion thereof is always being drawn downwardly and further- 2o more that sub-atmospheric pressure tends to draw the rubber against the inner wall of the cylinder. 'I'hls very tendency which causes a. braking or jamming action withthe -bag ofmy prior patent above identified, here operates advantageously in the present case to prevent jamming or braking of the diaphragm itself slncein the present case there is never any tendency to drag the rubber along the inside surface Vrif-the cylinder wall. f j f The connection between the upper` or Vinner clamping'thimble and the walking beam 21 which is pivoted on the rock shaft I5 maycorrespondto the connection illustrated in my prior application above identified. Pairs of links; 28 -nivoted 35 as at v29 to thevends of thewalking beam extend into the thimbles and are pivoted upon'a bushing 30 carried by cross pin 3|,the ends of which are xed in the thimble 2|. The bushingf30: is re ducedgat its ends as at 30a (Fig. 10)` to prevent 40A Rock shaft assemblage l 4,.

ing to denitely position the rocker arm exten- 55 sion 33 is a second bushing 38 oscillatable in a bore .33 in the post I3,.which bore is axially aligned with bore 31. 'I'he bushing 33 is pro-V vided with ahead 40 working against `one facev of the post I3'.to limit axial movement of the G0 rocker arm assembly in one direction. The adjacent ends of the ltwo bushings are forced against opposite sides of the rocker arm extension 33. The gear 35 is slipped over the squared projecting end of the rock shaft I5 and' 65 is forced against the outer end of .the longer bushing 33 by upsetting or riveting over the end of the rock shaft as at II.

'I'he sequence of assembly operations. 'is as followsz- I 70 First the gear is riveted onto the end of the shaft I5,'then the bushing 36'is forced over y the shaft I5 until it abuts the gear 35; then -the shaftand 'bushing 36 are inserted through the 'front of the post I4 and the squared end ofthe 75 after the shorter bushing 33 is forced home tov lock the entire assemblage consisting of Athe 5 walking beam, the rock shaft, the two bushings and the gear 35v against independent movement. Inasmuch` as the ends of the'walking beam are already connected by links to the two guide cups the automatically correct keying of the walking beam extension and the gear on the rock shaft asan incident of assembly insures rockin'g of the gear through exactly the correct arc as' the working chambers are alternately ensmalled and enlarged to effect oscillation of the walking beam. 15 It will be borne in mind that the gear 35 meshes with a gear l42 on the wiper carrying shaft 43 which is mounted in the casting I and that the Y shaft 43 controls the motion of the snap valve mechanism indicated generallyl at S (Fig. 1). Thus since thefrocker arm assembly insures the. movement of the gear 35 through exactly the right range, timing of the valve is automatically takenlcare of assuming that the gears are .cor' -rectly intermeshed with respect to ea'ch other.' 'Ihis can readily be assured by placing registering marks 90 on the. tooth of one gear and adjacent the tooth receiving' interdental space o f the other gear. This is in direct contradistinction to the vrocker arm assemblage of prior Patent No.

1,912,777` where great care had to be exercised in order to lock the segment gear 35 and walking beam at exactly the c'orrect relative angle on a round shaft.

The eccentric gears of thewalking beam structure, a stud 44 projects from the face of the ,boss I2 and coacts with an arcuate slot 45 in the toothed segment or gear l35. It will be observed that the arc of the toothed portionv 42a of the gear 42 is not an arc drawn about the axis of the shaft 43 but that the center teeth oi' this set 42a are closer to the axis of the shaft 43 than the end teeth. A complementary eccentric tooth arrangement is provided on the lower toothed end 35a o f the segment member 35 except that here the center teeth oi the set 35a are furtherremoved from the axis of the rock shaft I5 than arethe end teeth of `the set 35a. It will thus be apparent that when the centers of the toothed sections of the gears are in mesh, that is to say, when the collapsible walled chambers are approximately midway of their respective strokes, the leverage of gear 3l andY lgear 42 will be at its minimum and this leverage will increase toward the ends of the stroke.

It will also'be apparent that upon the initia.

tion of the stroke, the highest leveragewill prevail. This gearing arrangement as above 'suggested insures the application of greatest power to the blade at the start' of the stroke and at the end of the stroke. It quickly tends to overcome any tendency to lag due to blade inertia at the start voi! the stroke and it is effective to sup- 55 ply the additional power necessary to advance an increasingly heavy loadof snow before the wiper blade at the end of the stroke and prevent stalling'of the blade at a point just before the snapvalve action is tripped.

The parallel -unka'qe control 1n may to lo I have illustrated a slightly modified vconstruction in which the socket member 28 is eliminated and means is ex- 75 ternally of the working lchambers to eectively` chamber.

prevent any tilting of the control members as they move in and outv of the cylinders. In this case the thimble 22a corresponding to the thimble 22 may be considerably shortened since it no -longer has any guiding function.

Y to links 28, of slightly greater width and/ or thickness, or by making the thimbles of slightly less internal diameter so that the tight t of the links within the thimble prevents pivotal movement between the links and thimbles.

Also one link of each pair is longer than itsl fellow and above its point of pivotal connection with the walking beam itis provided with an offset upward extension or ear 50 pivoted as at 5I to the end of a secondary lever 52, the latter being fulcrumed intermediate its ends as indicated at 53 upon the rear face of the post I4.

The pivot of the lever 52 is in the same vertical plane as the pivot, i. e. rock shaft connection of the walking beam 2] and the vertical distance between pivot 53 and the axis of the rock shaft I5 corresponds exactly with the vertical distances between the pivotal connections at 5l and 29 between the links 28a and the levers 52 and 21 respectively. Thus a true parallel lever system is provided'comprising levers 21, 52 and the links which connect the ends of these levers. and the Asa means for positively limiting movement guide cups 2l are restrained by this lever system against tilting or canting. Any internal guide means such as the socket is rendered unnecessary.

In this connection it may be noted that the socket might be omitted even .with the construction of Fig. 1 and the thimble 22 correspondingly shortened, since with a properly molded diaphragm or cup it is merely necessary to reinforce the center of the cup in order to insure steady uniform folding movement or iiexure of the cup or bag as air is alternately exhausted from and admitted to the chamber., Also if the skirt portions IS of ythe cups were suiliciently stiff or suitably-reinforced the body or casting need constltute only the base or bottom of the working Any other suitable means (such for instance as that shown in prir. Patent No. 1,912,777) for coupling a resilient diaphragm to a body so thatthey cooperatively form a collapsible walled chamber might be resorted to.

The purpose of the guide mechanism, whetherA internal or external, is to guard against any tilting or canting of the bag centers which mightA dust cover C is removed. 'Ihe center of the dia- Dhrgm or bag will normally inherently tend'to move directly inwardly without canting regardless of any guide mechanism and the guide Vmech.-

anism herein illustrated is primarily intended toV inhibit tilting and canting and consequent jerky vple attachment for regulating the speed of Y.time

motor. In thisview il represents a rigid pipe or tube forming part ofthe suction line which 'con-- nects the motor to the intake manifoldror other source of suction. This pipe is provided inter- A mediate its endswith a laterally extending nipconnection'with an internally threaded socket 62- formed in a nut 63 to be screwed over the nipple. Nut 63 has a central air bleeding passageway 6I therein alignedwith the passage of the nipple 6| A coiledA expansion spring 65 encircling the nipple 6l, reacting against the pipe-60 and bearing against the nut 63 tends to hold this nut in any desired position ofv adjustment. Coacting with the inner end of the port 64 is a valve 66 here illustrated as a ball valve but whichmay be of any desired character, the valve being held against its seat by a spiral spring 61 reacting against the end -of the nipple 6I. l

It will be observedthat by manually adjusting the nut 6l, the tension on the valve 66 may be regulated and this valve tension determines the maximum speed-of operation of the wiper. It will also be observed that by screwing the nut 63 fully home, the valve 66 may be forced against the outer end of the passage in the nipple 6| to positively block any entrance of `air into the Apipe 60.

In normal operation however, the valve 66 is:

unseated by diierential internal and external pressures whenever abnormally low pressures pre-` eective governor of the maximum motor speed f and yet is devoid o f any parts-which project into or obstruct the free ow of, air through the pipe 60. It will also be apparent that Fig. shows merely a crude and elementary form of auxiliary speed control mechanism operating solely on the air bleeding principle.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1, In a suction motor a working chamber including a cylindrical socket and a power applying member comprising a-molded rubber dial phragm closing the mouth of the socket, reinforcing means ixed wit` respect to the center of the diaphragm, said diaphragm including an annular inwardly extending bight or fold por- 55 tion disposed between said reinforcing means and the socket wall, said diaphragm being molded normally so as to tend to urge the reinforced central portion inwardly toward the bottom of the socket.

2. In a suction motor a working chamber lncluding a cylindrical socket and a powerapplying member comprising a resilient diaphragm closing the mouth of the socket, `reinforcing means fixed with respect to the center of the diaphragm, said diaphragm including an annular inwardly extending bight or fold portion disposed wardly extending, approximately cylindrical member connected to the center of the diaphragm and 'suirlciently smaller in diameter than the socket to prevent pinching of thevbight of the diaphragm between the reinforcing member and the socket, the diaphragm tending by its own inherent resiliency to moveinwardly toward the bottom of the socket and means predetermining the range of movement of the diaphragm so that a portion of the bight always lies against the inside wall of the socket and a. portion of the bight always lies against the outer cylindrical surface of the reinforcing member.

3. In a suction motor, a working chamber, said chamber including a rigid cylindrical portion and a rubber cup telescoped over the mouth of said cylindrical portion and constituting the power applying movable chamber wall, reinforcing mean's at the center of the cup substantially preventing exure of the cup` center, the material of the cup affording an inwardly extending annular bight portion between the reinforcing means and the cylinder mouth, Ithe skirt portion of the cup which telescopes over the cylindrical portion and the central reinforced portion of the cup being of substantially greater thickness than the bight portion'.

4. In a suction motor,v a working chamber,

said chamber including a rigid cylindrical portion and a rubber cup telescoped over the 'mouth of said cylindrical portion and constituting the power applying movable chamber wall, rein-- forcing means at the center of the cup substantially preventing exure of the cup center. the material of the cup affording aninwardly extending annular bight portion between the reinforcing means and the cylinder mouth, the skirt portion of the cup which telescopes over the cylindrical portion and the central reinforced portion of the cup being of substantially greater thickness than the bight portion, the reinforced cup center due to the inherent resiliency of the cup normally tending to move inwardly toward the bottom of the socket.

5. A motor of the class described including a body member presenting a pair of spaced parallel sockets, rubber diaphragms closing the mouths of the sockets, a walking beam fulcrumed between the sockets, means connecting the ends of the walking beam to the diaphragms, means reinforcing 'the centers of the diaphragms and said diaphragms including annular inwardly extending bight portions lying in all positions of movement of the diaphragms between said reinforcing members and the walls of the sockets, said reinforcing members being generally cylindrical and of substantially smaller diameter than the sockets and means to substantially prevent canting of the reinforced central diaphragm portion as air is alternately exhausted from and Aadmitted to the chambers, said last named means being arranged exteriorly of the working chambers.

6. A motor of the class described including a body member presenting a pair of spaced parallel Working chambers, rubber diaphragms constitutlng the movable Walls of said chambers, a Walking beam fulcrumed between the chambers, means reinforcing the centers of the diaphragms and means rigid with said reinforcing means yconnecting the ends of the walking beamto the diaphragms, means coacting with the walking beam to substantially prevent canting of the reinforced central diaphragm portions as air is alternately exhausted from and admitted to the chambers, .said last named means' including a secondary lever, parallel'to the walking beam, pivoted at its ends to said rigid connecting means and coacting with the walking beam to afford a parallel lever motion. y Y

lco

.DAVID KUSKIN. 7a 

